September weather forecast
Saint-Denis, Reunion

September represents a moderate weather month for Saint-Denis with temperatures presenting a small hike in comparison to the past month. Rainfall reaches its lowest point for the year, merely 50mm (1.97"). September therefore serves as a welcoming gateway to the year’s end, setting a premium for open-air activities and scenic excursions. A gentle increase in sea temperatures paves the way for the upcoming summer season, offering an inviting prospect for beach enthusiasts.

Temperature

Saint-Denis marks the onset of September with an average high-temperature of a still moderately hot 25.8°C (78.4°F), a subtle shift from August's 25.3°C (77.5°F). The low-temperature average for Saint-Denis during September stands at a comfortable 18.6°C (65.5°F).

Rainfall

In Saint-Denis, Reunion, in September, during 8.1 rainfall days, 50mm (1.97") of precipitation is typically accumulated. In Saint-Denis, during the entire year, the rain falls for 119.3 days and collects up to 1659mm (65.31") of precipitation.

Sea temperature

The months with the coldest seawater in Saint-Denis are August and September, with an average sea temperature of 23.8°C (74.8°F).
Note: For those with a heightened sensitivity to cold, sunshine, wind, and outside temperature make a big difference in enjoying a swim at 23.8°C (74.8°F). (Olympic swimming regulations state a water temperature of 25°C (77°F) to 28°C (82.4°F).)

Daylight

In Saint-Denis, the average length of the day in September is 11h and 59min.
On the first day of the month, sunrise is at 06:26 and sunset at 18:09. On the last day of September, in Saint-Denis, sunrise is at 05:59 and sunset at 18:16 +04.

Sunshine

In September, the average sunshine is 7.1h.

UV index

In Saint-Denis, Reunion, the average daily maximum UV index in September is 10. A UV Index estimate of 8 to 10 represents a very high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: A typical high UV index of 10 in September suggests the following recommendations:
Always take safety measures. The skin and eyes are at risk if left exposed. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. To ensure you’re protected from sunburn, always use sunscreen with a minimum 30 SPF. This also fights the Sun’s radiation effects on the immune system. Attention! UV radiation is ramped up when reflecting off sand and water surfaces.